Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9f35b1582a4eb1…

MALICIOUS

PDF

80.1 KB Created: 2021-03-10 20:56:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: d9377cdbef8277002e141e90022218b9 SHA-1: e467097508edf278b0ac1386f12bb2d105cda853 SHA-256: 8e9f35b1582a4eb13eccd231fdd8b5cbe36a09f1f7fc3bd07d1dae408d6c0a90
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, many pointing to disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation. While no scripts were extracted, the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://lozipotod.ru/strik?utm_term=how+to+use+music+and+talking+hbs-730 PDF link annotation
    • https://cdn.sqhk.co/mazonixun/iihavgh/xalivitagevuzasexilabof.pdfIn PDF document text
    • https://cdn.sqhk.co/jedelamodafa/ihigLF0/miranda_cosgrove_hehe_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/divoxisig/r2igXhc/flashlight_taser_stopped_working.pdfIn PDF document text
    • https://cdn.sqhk.co/rijunawep/bxjejjI/streets_of_rage_1_playable_characters.pdfIn PDF document text
    • https://mewotetinud.weebly.com/uploads/1/3/5/9/135956813/404467cb3bb2918.pdfIn PDF document text
    • https://cdn.sqhk.co/bepeguvovori/dVgjkgj/30632162730.pdfIn PDF document text
    • https://cdn.sqhk.co/zoburawava/6ziguw0/vofodom.pdfIn PDF document text
    • https://wepuporo.weebly.com/uploads/1/3/2/7/132741302/4551109.pdfIn PDF document text
    • https://cdn.sqhk.co/lojiwoxaz/jS3s8jh/wrench_or_twist_crossword_puzzle_clue.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/e2pAjij/paradise_go_long_go_long_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/Bijgi3E/power_hover_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ninazarila/links_bracelet_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/best_new_monster_movies_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22463c9f-e85e-4251-a1e1-a637b19705f7/how_to_make_a_smoothie_with_frozen_fruit_milk_and_ice_cream.pdfIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_3ce2b3a25c9f4da4a44d60f664089b04.pdf?index=trueIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_73942fda99854f208d8ee062751f800d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b240ee5-81d5-44de-b5fc-a52f608755b1/13572388139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2372068f-53ce-4d5d-a169-1d84ece73bb4/viduneb.pdfIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_618b11bb4c7b4f6ca839e57089efa465.pdf?index=trueIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_0d052e0bae1c4858b18e00c9dc85d355.pdf?index=trueIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_62abe55923ab4a65bf635d1e04f43316.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ece45ce-cb59-4d18-bd3c-714fbef768b5/givosilolebufiwaninivu.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/30285690809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b35abbd-64a4-4835-949a-1bf48eae4d60/34693190877.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/cozy_grate_fireplace_heater_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 5816 bytes
SHA-256: b96972b88ef53e34289a90fcb7ae13703c2dcf95ba0fa08d4373c6c125400a93
font_01_sfnt_off0000fd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD17 11496 bytes
SHA-256: 788bc4399b2542c49761e061391eb23f33ddbcbc9f0b05b2163a1722b729fc15
font_02_sfnt_off00012418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12418 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176